xref: /freebsd/share/man/man3/pthread_attr_get_np.3 (revision f9218d3d4fd34f082473b3a021c6d4d109fb47cf)
1.\" Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\"    notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\"    notice, this list of conditions and the following disclaimer in the
11.\"    documentation and/or other materials provided with the distribution.
12.\"
13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23.\" SUCH DAMAGE.
24.\"
25.\" $FreeBSD$
26.\"
27.Dd January 31, 2003
28.Dt PTHREAD_ATTR_GET_NP 3
29.Os
30.Sh NAME
31.Nm pthread_attr_get_np
32.Nd get attributes of existent thread
33.Sh LIBRARY
34.Lb libc_r
35.Sh SYNOPSIS
36.In pthread_np.h
37.Ft int
38.Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst"
39.Sh DESCRIPTION
40The
41.Fn pthread_attr_get_np
42function is used to get existent thread's attributes.
43Most fields of
44.Vt pthread_attr_t
45structure are exact values of attributes provided at thread creation
46time (as parameter to
47.Xr pthread_create 3
48function), except for the stack address.
49.Pp
50Value returned as
51.Fa dst
52is supposed to be used in conjunction with
53.Fn pthread_attr_get*
54functions to retrieve individual values from
55.Vt pthread_attr_t
56structure.
57Parameter
58.Fa dst
59should point to allocated memory area big enough to fit this structure.
60.Pp
61It is HIGHLY RECOMMENDED to use
62.Xr pthread_attr_init 3
63function to allocate attribute storage.
64.Sh IMPLEMENTATION NOTES
65The
66.Fn pthread_attr_get_np
67function will always return a pointer to the thread's real stack address,
68regardless of its value in the original attributes structure.
69.Sh EXAMPLES
70.Bd -literal
71size_t
72my_thread_stack_size(pthread_t pid)
73{
74    pthread_attr_t attr;
75    size_t size;
76
77    pthread_attr_init(&attr);
78    pthread_attr_get_np(pid, &attr);
79    pthread_attr_getstacksize(&attr, &size);
80    pthread_attr_destroy(&attr);
81    return(size);
82}
83.Ed
84.Sh RETURN VALUES
85If successful,
86.Fn pthread_attr_get_np
87function returns 0.
88Otherwise, an error number is returned to indicate the error.
89.Sh ERRORS
90.Fn pthread_attr_get_np
91will fail if:
92.Bl -tag -width Er
93.It Bq Er EINVAL
94Invalid value for one of given parameters.
95.It Bq Er ESRC
96No thread could be found corresponding to that specified by the given
97thread ID.
98.El
99.Sh SEE ALSO
100.Xr pthread_attr_destroy 3 ,
101.Xr pthread_attr_getdetachstate 3 ,
102.Xr pthread_attr_getinheritsched 3 ,
103.Xr pthread_attr_getschedparam 3 ,
104.Xr pthread_attr_getschedpolicy 3 ,
105.Xr pthread_attr_getscope 3 ,
106.Xr pthread_attr_getstack 3 ,
107.Xr pthread_attr_getstackaddr 3 ,
108.Xr pthread_attr_getstacksize 3 ,
109.Xr pthread_attr_init 3
110.Sh AUTHORS
111The
112.Fn pthread_attr_get_np
113function and this manual page were written by
114.An Alexey Zelkin
115.Aq phantom@FreeBSD.org .
116